Image reader having a light-guiding transparent board

Details Image reader having a light-guiding transparent board Image reader having a light-guiding transparent board

1995-10-04

1997-12-09

Lee, Thomas D.

Facsimile and static presentation processing

Facsimile

Picture signal generator

358 84, 382321, H04N 104

Patent

active

056966075

ABSTRACT:
An image reader is equipped with a light source having a plurality of LEDs arrayed in a row, a light-guiding transparent board, a concave mirror, a condenser lens and a photoelectric converter. The transparent board is disposed between the light source and the concave mirror, and has an illuminating light output surface to be in contact with a document, an illuminating light input surface which is tilted at an angle relative to the output surface and on which light from the light source is to be incident, and first and second side surfaces located in opposition to each other between the illuminating light input and output surfaces. In operation, since the output surface is tightly in contact with the document, light dissipation is prevented. Since the input surface and the output surface are sufficiently separated from each other, rays of light emitted by the individual LEDs are mixed up inside the transparent board. Reflected light from the document travels inside the transparent board, is then reflected by the input surface, and goes out from the second side surface to the photoelectric converter via the condenser lens.

REFERENCES:
patent: 4813765 (1989-03-01), Negishi
patent: 5581076 (1996-12-01), Tabata

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